Update styles.css

changed to IBM Plex font family

Author: JAnns98

nbs/styles.css

@@ -1,3 +1,16 @@
+/* Import IBM Plex Sans from Google Fonts */
+@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,700;1,400;1,700&display=swap');
+
+/* Set IBM Plex Sans as the default font for the entire document */
+body {
+  font-family: 'IBM Plex Sans', sans-serif;
+}
+
+/* Optional: Set IBM Plex Mono for code blocks */
+code, pre, .sourceCode {
+  font-family: 'IBM Plex Mono', monospace;
+}
+
 .cell {
   margin-bottom: 1rem;
 }